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Dhaka regional 2015 secondary/4

Posted: Mon Jan 18, 2016 7:12 pm
by Ragib Farhat Hasan
ABCD is a parallelogram and it’s diagonals meet at point O. P and Q are the
midpoints of AO and BC consecutively. ∠A = ∠DPQ and ∠DBA = ∠DQP. If AB=2 unit, then find out the area of ABCD.

Re: Dhaka regional 2015 secondary/4

Posted: Mon Jan 25, 2016 9:04 pm
by asif e elahi
Prove $ABCD$ is a square using spiral similarity.

Re: Dhaka regional 2015 secondary/4

Posted: Sun Dec 25, 2016 8:51 am
by Absur Khan Siam
Can anyone tell me a resource for understanding spiral similarity well?